Driving mechanism



C. G. THOMPSON.

DRIVING MECHANISM.

APPLICATION FILED JULY 22. 1921.

Patented Jan. 17, 1922.

2 SHEETS-SHEET l- C. G. THOMPSON.

DRIVING MECHANISM. APPLICATION FILED JULY 22, 1921.

Patented Jan. -17, 1922.

2 SHEETS-SHEET 2.

Mia/W @d'? wwtey PATENT OFFICE.

CARL G. THOMPSON, OF KNOXVTLLE, TENNESSEE.

DRIVING MECHANISM.

Application filed July 22 T 0 all whom it may concern:

Be it known that I, CARL G. THoMPsoN, a citizen of the United States, residin at Knoxville, in the county of Knox and tate of Tennessee, have invented certain new and useful Iln ovements' in Driving Mechanism, of which t rjollowing is a specification.

This invention relates to mechanism specially adapted for gyrating shaking bolts or chop graders which are provided with sieves and are suspended from" stationary supports; and it consists in the novel construction and combination of the parts hereinafter fullydescribed and claimed whereby the sieve casing is placed out of balance gradually and is .gyrated without any jerking movements.

In the drawings, Figure 1 is a side view of a portion 'of a ratory sieve casing, showing how the device is applied to it. Fig. 2 is a side ,view of a driving mechanism constructed according to this invention. Fig. 3 is a plan viewof the same with the top plate of the frame removed. Fig. 4 is a plan view, similar to Fig. 3, showing a modification of the mechanism shown in Figs. 2 and 3.

The Sifter casing 5 is suspended from rafters 6, or other supports, by-resilient rods 7 which permit the casing to gyrate in a horizontal plane. ..-The sieves and other devices inclosed'in the casing are of any ap- .ved kind. A vertical shaft 8 is journaled in similar bearings 9 on the top and bottom parts of the casing, and is revolved by a belt pulley 10. Two similar driving mechanisms are preferably provided, and are secured tovthe shaft 8 above and below the casing.

Each mechanism has a frame 12 which is secured to the shaft 8, and which is preferably formed of upper and lower plates 14 and 15 provided with one or more suitable distance pieces 16. Two ins 17 are arranged in the frame 12 substfiiitiilffiifillblf to each other and to the shaft 8 ,-and=atequa1: distances from the shaft 8 and upon one side of it. Arms 18 are pivoted on thesepins,

, and have hubs 19 rovided with intergearing teeth 20, so that t e arms are constrained to move simultaneously in opposite directions on their ivots. These arms 18 have weight-s at their ree ends, and these weights 21 are preferably formed of boxes which are filled with lead or other heavy material, the quantity of which may be varied and adjusted. The arms 18 have antifriction rollers 22 at arrange Specification of Letters Patent. Pate t d J 17 1922 1921. Serial No. 488,783.

their outer parts which run on the lower plate 15, which is flat or which has a flat track for the rollers to run on, so as to reduce the friction.

Helical springs 24 are secured to the arms 18 at one end, and at the other end to the frame. The frame preferably has an anchor bar 25 which projects horizontally on the longitudinal center line 26 drawn through the anus of the driving shaft 8, and midway between the two pivot pins 17. This anchor bar is preferably bolted to the frame at one end, and it has a series of holes 27 at its other end portion, arranged at different distances from the center line 26. The springs 24 are connected to the anchor bar by pins 28, and the object of having a series of holes for the (pins is to enable the springs to be at different angles with each other and the center line 26, so that they may work to the best advantage.

The springs may also be connected to the arms 18 at different points, if desired. A weight 30 is secured to the frame 12 on the center line 26, and on the opposite side of the shaft 8 from the anchor bar 25. This weight substantially balances the mechanism when the parts are in their normal position,

and when the weights 21 of the arms 18 are on the same side of the cross center line 31 of the driving shaft 8 as the anchor bar 25, as shown in full lines in Fig. 3. The cross center line 31 of the driving shaft is arranged at a right angle to the longitudinal center line 26.

When the driving shaft is revolved, the weighted arms 18 Tare moved gradually by centrifugal force in a horizontal plane across the cross center line 31 to the positions shown in dotted lines in'Fig. 3, in which the said arms are radial of the driving shaft. As the driving shaft is vertical, and as the pivot of each arm 18 is also-vertical, and as the arms move in a horizontal plane, the action of this is such thatthe mechanism takes up very little .room vertically. 1

I In themodification shown .in Fig. 4, the two weighted arms 18 are pivoted on a single vertical pivot pin 37 secured to the frame 12 .100 driving mechanism is .venysmooth, and free from jerks, and the arrangement of thegparts and arranged parallel to the vertical driving shaft 8. The weighted. arms .18 are con-;

strained to move simultaneously in opposite directions by meansiof two'connecting-rods 38 which are pivoted to the arms at one end .by pins 39, and at the other end to a slide 40 by pins 41. The slide 40 slides on a guide rod 12 secured to the frame 12 and its anchor bar, and the arms are retracted by a helical spring 43 arranged in compression between the shde 40 and an abutment 44 on the frame.

What I claim is:

1. The combination, with a gyratory device, of a vertical driving shaft journaled in the said device, and a drivin member revolving with the said shaft an working on a vertical pivot in a horizontal plane, said driving member being moved into an unbalanced position by centrifugal force when revolved, and operating to gyrate the dev1ce.

2. The combination, with a gyratory device, of a vertical driving shaft journaled in the said device, and a air of weighted arms revolving with the sai shaft, each arm working on a vertical pivot and in a horizontal plane, said arms being moved over the cross center line of the driving shaft into an unbalanced position by centrifugal force as the shaft is revolved.

3. The combination, with a gyratory device, ofa vertical driving shaft journaled in the said device, and a pair of weighted pivoted substantially parallehtof arid arranged .o'n oneside'of th'esa-id shaft and revolved' it in al'horizontali plane, and in volve arms pivoted substantially parallel to and arranged on one side of the said shaft and revolved by it in a horizontal plane, said arms being moved into an unbalanced position by centrifugal force as the shaft is re- 4. The combination with a gyratory device, of a vertical driving shaft journaled in the said device, a frame secured on the said shaft and a pair of weighted arms pivoted to the said frame by vertical pivots and arranged on one side of the said shaft.

5. The combination, with a gyratory device, of a vertical driving shaft journaled in the said device, a pair of weighted arms pivoted Substantially parallel to and arranged onone side of the said shaft and revolved by it in a horizontal plane, and means which constrain the said arms to move pivotall in opposite directions.

6. The com ination, with a gyratory device, ofna vertical driving shaft journaled in the'said device, aapair of. weighted arms tergearing toothed members which constrain the said arms to move pivotally in opposite directions.

7. The combination, with a ratory device, of a vertical driving sha z journaled in the said device a pair of weighted arms with the said shaft, each arm working on a vertical pivot and in a horizontal plane, and

helical springs securedto the arms at one end and to the frame at the other end and operating to restore the said arms to their normal balanced positions when the driving shaft ceases to revolve.

9. .The combination, with a gyratory device, of a vertical driving shaft journaled in the said device, a pair of weighted arms pivoted substantially parallel to and arranged on one side of the said shaft, an

anchor bar also revolving with the said shaft and projecting on a longitudinal center line drawn through its axis and midway between the pivots of the said arms, and helical springs arranged between the said .arms and the anchor bar at an angle to the said center line and operating to restore the said arms "to. their normal balanced positions when the driving shaft ceases to re-, volve.

10. The combination, with agyratory device, of a vertical driving shaft journaled in the said device, a pair of weighted arms pivoted substantially parallel to and arranged at one side of the said shaft, and a weight also revolving with the said shaft and projecting on a longitudinal center line drawn through its axis and midway between the pivots of the said arms, said weight operating to balance the said arms when in their normal-positions on the other side of the cross center line of the said shaft from the said Weight. f In testimony whereof I have aflix ed mysighature', l

" cAliL GrTHdM-PSON. 

